native_client_sdk/src/libraries/nacl_io/socket/fifo_packet.h

   1 // Copyright 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef LIBRARIES_NACL_IO_FIFO_PACKET_H_
   6 #define LIBRARIES_NACL_IO_FIFO_PACKET_H_
   7
   8 #include <string.h>
   9
  10 #include <list>
  11
  12 #include "nacl_io/fifo_interface.h"
  13 #include "ppapi/c/pp_resource.h"
  14
  15 #include "sdk_util/macros.h"
  16
  17 namespace nacl_io {
  18
  19 class Packet;
  20
  21 // FIFOPacket
  22 //
  23 // A FIFOPackiet is linked list of packets.  Data is stored and returned
  24 // in packet size increments.  FIFOPacket signals EMPTY where there are
  25 // no packets, and FULL when the total bytes of all packets meets or
  26 // exceeds the max size hint.
  27 class FIFOPacket : public FIFOInterface {
  28  public:
  29   explicit FIFOPacket(size_t size);
  30   virtual ~FIFOPacket();
  31
  32   virtual bool IsEmpty();
  33   virtual bool IsFull();
  34   virtual bool Resize(size_t len);
  35
  36   size_t ReadAvailable();
  37   size_t WriteAvailable();
  38
  39   // Return a pointer to the top packet without releasing ownership.
  40   Packet* PeekPacket();
  41
  42   // Relinquish top packet, and remove it from the FIFO.
  43   Packet* ReadPacket();
  44
  45   // Take ownership of packet and place it in the FIFO.
  46   void WritePacket(Packet* packet);
  47
  48  private:
  49   std::list<Packet*> packets_;
  50   uint32_t max_bytes_;
  51   uint32_t cur_bytes_;
  52
  53   DISALLOW_COPY_AND_ASSIGN(FIFOPacket);
  54 };
  55
  56 }  // namespace nacl_io
  57
  58 #endif  // LIBRARIES_NACL_IO_FIFO_PACKET_H_